Homebrew/homebrew — pull request #30535 by aelam (2014-06-29 15:26:38+00:00)
Title: update android-sdk,add build-tools to var

I have noticed the last sentence in this formula

# The 'android' tool insists on deleting #{prefix}/platform-tools
# and then installing the new one. So it is impossible for us to redirect
# the SDK location to var so that the platform-tools don't have to be
# freshly installed EVERY DANG time the base SDK updates.

I think the previous contributors were aware of this problem, so I am not very sure if my PR is CORRECT(or the best way).
But I have verified on my MAC, it works.
I hope someone can evaluate it